Automatic grinding device for metal pipeline

Abstract

The invention belongs to grinding devices, and particularly relates to an automatic grinding device for a metal pipeline. The automatic grinding device for the metal pipeline comprises a rotating mechanism surrounding the metal pipeline, a centering positioning mechanism, a pushing mechanism and a grinding device are arranged on the rotating mechanism, the centering positioning mechanism is used for being aligned with the circle center of the metal pipeline, and the pushing mechanism is used for driving the grinding device to move. The device has the remarkable effects that in the using process, only the annular guide rail needs to be arranged on the outer side of the metal pipeline in a sleeving mode, then the centering positioning mechanism is fixedly connected with the metal pipeline, and the annular guide rail and the metal pipeline are coaxial.

Description

Technical Field

[0001] The present invention belongs to the grinding device, and particularly relates to an automatic grinding device for metal pipelines. Background Art

[0002] A pressure pipeline refers to a pipeline system that bears internal or external pressure and is used for transporting, distributing, mixing, separating, discharging, metering, controlling, and blocking the flow of fluids. It consists of multiple components, including pipes, pipe fittings, flanges, bolt connections, gaskets, valves, other components or pressure-bearing parts, and supports, etc. These components are connected together by welding, threaded connection, or other connection methods to form a complete pipeline system.

[0003] During the construction of domestic nuclear power units, metal pressure pipelines are fixed together by welding. The surface of the spliced weld after welding is not smooth and there are oxide scales and welding slag. For application scenarios with high requirements such as nuclear power equipment, the welds on the outer wall of the metal pressure pipeline need to be smooth, and the weld quality is crucial for the safe and reliable operation of the system. At present, the grinding of the outer surface of the pressure pipeline applied to nuclear power is carried out by manual grinding. However, for the side close to the wall or far from people, manual grinding is often difficult to carry out, and the efficiency of manual grinding is low, and the grinding effect is not ideal. Summary of the Invention

[0004] The present invention aims at the defects of the prior art and provides an automatic grinding device for metal pipelines.

[0005] The present invention is implemented as follows: An automatic grinding device for metal pipelines, which includes a rotating mechanism surrounding the metal pipeline, and a centering positioning mechanism, a pushing mechanism, and a grinding device are arranged on the rotating mechanism. The centering positioning mechanism is used to align the center of the metal pipeline, and the pushing mechanism is used to drive the grinding device to move.

[0006] An automatic grinding device for metal pipelines as described above, wherein the centering positioning mechanism includes a fixed motor base, and screw holes are provided on the fixed motor base for the fixed connection between the centering positioning mechanism and the rotating mechanism. A support foot is arranged on the side of the fixed motor base facing the metal pipeline, and an arc-shaped groove matching the outer surface of the metal pipeline is provided on the support foot. A limit sensor is also arranged on the side of the fixed motor base facing the metal pipeline, and a stepping motor, a lead screw, and a guide post are respectively arranged on the side of the fixed motor base facing away from the metal pipeline.

[0007] An automatic grinding device for metal pipelines as described above, wherein a total of four centering positioning mechanisms are provided and are evenly arranged along the rotating mechanism.

[0008] An automatic grinding device for metal pipes as described above, wherein the pushing mechanism includes a lifting mechanism. The lifting mechanism is provided with a threaded hole and is used to fixedly connect the pushing mechanism with the rotating mechanism. A cross-arm axial feeding mechanism is arranged on the lifting mechanism, and a grinding machine fixing device is arranged on the cross-arm axial feeding mechanism. The grinding machine fixing device is used to fix the grinding wheel, and a support frame is arranged below the grinding machine fixing device.

[0009] An automatic grinding device for metal pipes as described above, wherein the lifting mechanism includes a bottom plate. A laser ranging mounting plate is arranged on the side wall of the bottom plate, and a positioning sensor and a laser ranging sensor are arranged on the laser ranging mounting plate. A top plate is arranged at the top of the bottom plate, a screw rod stepping motor is arranged above the top plate, a tail plate is arranged at the bottom of the bottom plate, guide columns are arranged between the top plate and the tail plate, a slider is arranged on the guide columns, and a connecting hole is arranged on the slider for connecting with the cross-arm axial feeding mechanism.

[0010] An automatic grinding device for metal pipes as described above, wherein the rotating mechanism includes an annular track, a fixing plate is arranged on the annular track, and rollers and a stepping motor driving gear are arranged on the fixing plate.

[0011] An automatic grinding device for metal pipes as described above, wherein a groove is arranged on the annular track, and the fixing plate moves along the groove through the rollers.

[0012] An automatic grinding device for metal pipes as described above, wherein four rollers are arranged, and two rollers are arranged above and below the groove respectively.

[0013] An automatic grinding device for metal pipes as described above, wherein when multiple annular tracks form the entire track, adjacent annular tracks are fixedly connected by connecting pieces.

[0014] The remarkable effects of the present invention are as follows: 1. During the use of the present invention, only need to sleeved the annular guide rail on the outside of the metal pipe, and then connect and fix the centering positioning mechanism with the metal pipe, so that the annular guide rail and the metal pipe are coaxial.

[0015] 2. During the clamping process of the entire grinding device of the present invention, four compression mechanisms are used to fix the entire grinding device. And a limit sensor is installed on the support feet to limit the up and down movement of the stepping motor driving the screw rod. It can prevent the compression mechanism and the metal pipe from being damaged due to the stepping motor continuously driving the screw rod during the clamping process.

[0016] 3. A positioning sensor and a distance measuring sensor are added to the rotating mechanism of the present invention. When the rotating mechanism drives the pushing mechanism to move, the position of the compression mechanism can be located by the positioning sensor, and the distance between the rotating mechanism and the surface of the metal pipe can be measured by the distance measuring sensor at this position. If there are slight deviations in the positions of the four compression mechanisms, fine adjustments can be made to make the annular guide rail and the metal pipe coaxial to ensure the machining quality of the grinding device.

[0017] 4. In the design of the axial feed in the pushing mechanism of the present invention, according to the principle of the lifting table, a lead screw stepping motor is used to drive the cross arm to perform axial feed movement. The structure is simple, and the axial feed of the angle grinder can be accurately controlled.

[0018] 5. The angle grinder of the present invention is fixed on the support frame. After the angle grinder is started, part of the torque generated during the process of the grinding wheel grinding the weld of the metal pipe can be offset by the support frame, avoiding the problem of the position deviation of the grinding wheel causing the machining quality problem of the grinding device. Description of the Drawings

[0019] Figure 1 Automatic Grinding Device for Metal Pipes of the Present Invention

[0020] Figure 2 Centering Positioning Mechanism of the Present Invention

[0021] Figure 3 Pushing Mechanism of the Present Invention

[0022] Figure 4 Lifting Mechanism in the Pushing Mechanism of the Present Invention

[0023] Figure 5 Cross Arm Axial Feed Mechanism in the Pushing Mechanism of the Present Invention

[0024] Figure 6 Rotating Mechanism of the Present Invention

[0025] Figure 7 Grinding Device of the Present Invention

[0026] In the figure: 1. Centering positioning mechanism, 2. Rotating mechanism, 3. Pushing mechanism, 4. Grinding device, 5. Metal pipe, 110. Support feet, 120. Fixed motor base, 130. Stepper motor, 140. Lead screw, 150. Guide pillar, 160. Limit sensor, 210. Ring track, 220. Roller, 240. Stepper motor drive gear, 250. Fixed plate, 260. Connecting piece, 310. Lifting mechanism, 311. Bottom plate, 312. Laser distance measurement mounting plate, 313. Positioning sensor, 314. Top plate, 315. Lead screw stepper motor, 316. Slide block, 317. Guide pillar, 318. Laser distance measurement sensor, 319. Tail plate, 320. Cross arm axial feed mechanism, 321. Bottom plate, 322. Fork arm, 323. Rotating shaft, 324. Top plate, 325. Motor mounting plate, 326. Motor, 330. Grinding machine fixing device, 340. Support frame, 410. Grinding wheel. Detailed implementation mode

[0027] An automatic grinding device for the weld of a metal pressure pipe mainly includes a centering positioning mechanism, a rotating mechanism, a pushing mechanism and a grinding mechanism. The centering positioning mechanism includes four compression mechanisms, and the whole grinding device is fixed by four support feet. The rotating mechanism includes two semi-circular ring rails, rollers and gears. The gears on the rotating mechanism drive the rollers to move along the rails by cooperating with the pins in the ring rails. The pushing mechanism has a lifting mechanism and a cross arm feeding mechanism, and the pushing mechanism is fixed on the rotating mechanism. And a grinding device for grinding the weld, which is fixed on the support frame of the cross arm feeding mechanism, and the cross arm feeding mechanism drives the angle grinder to move axially.

[0028] There are four compression mechanisms (this compression mechanism is also called the centering positioning mechanism) in the centering positioning mechanism. Each compression mechanism includes a stepper motor, a lead screw, a spring, a limit sensor and a support foot. The compression mechanism is fixed on the ring rail of the rotating mechanism through a support base. The stepper motors in the four compression mechanisms drive the lead screws to move downward at the same time. A compression block is installed at the bottom end of the lead screw. When the lead screw moves downward, the compression block at the bottom end of the lead screw compresses the spring in the cavity of the support foot to perform centering positioning on the grinding device. A pressure block guide rod is installed at each of the left and right ends of the support foot to guide the support foot during the up and down movement of the support foot. A limit sensor is installed on the compression mechanism to control the up and down movement of the stepper motor driving the lead screw.

[0029] The rotation mechanism includes two semi-circular annular pipes, gears, rollers, position sensors, and distance sensors. The two semi-circular annular guide rails are fixed by connecting pieces, and the connecting pieces are fixed on the annular guide rails by two pins on the left and right. The stepping motor drives the gears to cooperate with the pins in the guide rails, driving the rollers to move along the annular guide rails. During the movement of the rollers along the annular guide rails, the position sensors are used to position the four compression mechanisms fixed on the annular guide rails. At the same time when the position sensors locate the compression mechanisms, the distance sensors measure the distance from the rotation mechanism to the metal pipe to determine whether the annular guide rails are coaxial with the metal pipe. If there are slight differences, adjustments can be made through the compression mechanisms.

[0030] The pushing mechanism mainly consists of two parts. One part is the lifting mechanism to control the up and down movement of the angle grinder, and the other part is the cross-arm feeding mechanism to control the axial movement of the angle grinder. The pushing mechanism is fixed on the rotation mechanism through the bottom plate, and the rotation mechanism can drive the pushing mechanism to make a circular motion along the metal pipe. The lifting mechanism includes a lead screw stepping motor, guide columns, sliders, and a tail plate. The lead screw stepping motor drives the sliders sleeved on the guide columns to move up and down. During the movement of the sliders, the guide columns play a guiding role for the sliders. The cross-arm feeding mechanism includes a lead screw stepping motor and four cross-arm assemblies. The lead screw stepping motor drives the cross-arms to make telescopic movements to achieve the axial feeding of the grinding device.

[0031] The grinding device is mainly an angle grinder, and the angle grinder is fixed on the support frame of the cross-arm feeding mechanism through the grinding machine fixing device. Two roller bearings are installed at the bottom end of the support frame, and the bottom of the support frame is designed to be arc-shaped so as to provide support for the angle grinder and prevent the angle grinder from shifting due to large torque during the grinding process.

[0032] The metal pressure pipeline weld grinding device according to the above technical requirements is composed of a centering positioning machine rotation mechanism, a pushing mechanism, and a grinding device, and grinds the weld at a predetermined position; the rotation mechanism drives the propulsion mechanism to rotate, and the propulsion mechanism drives the grinding device to perform radial and axial movements, so that the weld grinding device grinds the weld at the connection of two metal pipes.

[0033] A specific example is given below.

[0034] Please refer to Figure 1, this embodiment provides a grinding device for the weld of a metal pressure pipeline, which includes a centering positioning mechanism 1, a rotating mechanism 2, a pushing mechanism 3 and a grinding device 4, where: A fixed motor base 120 is fixed between the centering positioning mechanism 1 and the rotating mechanism 2. The pushing mechanism 3 is fixed on a fixing plate 250 on the rotating mechanism through a bottom plate 311. The grinding device 4 is connected to a support frame 340 by a thread. The support frame 340 is fixed on a slider 316 on the pushing mechanism 3. When the slider 316 moves up and down, it drives the grinding device 4 to move up and down. When automatically grinding the weld of a metal pressure pipeline, the guide rail is installed at a predetermined position, and the automatic grinding device for the weld of the metal pipeline is positioned through the centering positioning mechanism. Refer to Figure 2 , the stepping motor in the centering positioning mechanism 2 is fixed on the fixed motor base fixed between the centering positioning mechanism 1 and the rotating mechanism 2. The stepping motor 110 drives the lead screw 140 to perform a vertical movement. During the vertical movement of the lead screw, a limit sensor 160 installed below the fixed motor base 120 fixed between the centering positioning mechanism 1 and the rotating mechanism 2 limits the displacement of the lead screw 140. When the lead screw 140 moves to the distance set by the limit sensor, the stepping motor 130 stops driving the lead screw 140. A compression block is installed at the bottom end of the lead screw, and a spring is installed in the cavity of the support foot 110. When the lead screw 140 performs a vertical movement, it drives the compression block to compress the spring so that the support foot 110 clamps the metal conduit. Four identical compression mechanisms are designed in the centering positioning mechanism 1. During the process of centering and positioning the device, the stepping motors 130 on the four compression mechanisms simultaneously drive the lead screw 140 to perform the above vertical movement to center and position the device, so that the device and the metal pipeline are coaxial. A guide post 150 is added to each of the left and right ends of the support foot. The guide post 150 is sleeved on the fixed motor base 120 fixed between the centering positioning mechanism 1 and the rotating mechanism 2. During the process of the stepping motor 130 driving the lead screw 140 to perform a vertical movement, the guide post 150 guides the lead screw 140. Refer to Figure 3 , Figure 4 and Figure 5, after the above positioning of the axis of the automatic grinding device for metal pressure pipelines and the metal pipelines, the grinding device 4 is pushed to the weld of the metal pipeline by the pushing mechanism 3. The pushing mechanism mainly includes a lifting mechanism and an axial feeding mechanism of the angle grinder. In order to make the rotating mechanism 2 drive the pushing mechanism 3 to rotate during rotation, the bottom plate 311 of the pushing mechanism 3 and the fixing plate 250 of the rotating mechanism 2 are connected and fixed by bolts. In the lifting mechanism, the slider 316 is driven to lift by the lead screw stepping motor 315 installed on the top plate 314. A guide post 317 is installed at each of the left and right ends of the tail plate 319 of the lifting mechanism. The guide post 317 passes through the slider 316. During the lifting of the slider 316, the guide post 317 plays a guiding role for the slider 316. During the process of the lead screw stepping motor 315 driving the slider to descend, when the support frame 340 supports on the metal pipeline, the lead screw stepping motor 315 stops. The grinding device 4 is pushed to the starting grinding position by using the cross-arm axial feeding mechanism in the pushing mechanism 3. The bottom plate 321 in the cross-arm axial feeding mechanism and the slider 316 in the lifting mechanism are fixed by bolts. During the lifting of the slider 316, the cross-arm axial feeding mechanism can be driven to lift. Refer to Figure 3 and Figure 7 , the grinding device 4 is pushed to the designated grinding position, the angle grinder is turned on, and the grinding wheel 410 starts to work. The angle grinder is fixed by the grinding machine fixing device 330 and is screwed to the support frame 340 of the pushing mechanism 3. Refer to Figure 4 and Figure 6 , the rotating mechanism 2 drives the entire pushing mechanism 3 and the grinding device 4 to grind along the outer wall of the metal pipeline. The two semi-circular annular tracks 210 in the rotating mechanism are connected by the connecting piece 260. The connecting piece 260 is fixed on the annular guide rail 210 by a pin. Four rollers 220 are installed on the fixing plate 250. The upper and lower groups of rollers are stuck in the grooves of the annular guide rail 210. The roller 220 is composed of a roller bearing and a rubber ring, so that it can better cooperate with the grooves in the annular guide rail 210 and helps the roller 220 move along the grooves of the annular guide rail 210. The gear fixed on the fixing plate is driven by a stepping motor, and the gear 240 cooperates with the pin on the annular guide rail 210 to drive the roller 220 to move along the grooves of the annular guide rail 210, so that the entire fixing plate 250 rotates. The positioning sensor 313 and the laser ranging sensor 318 are fixed on the bottom plate 311 of the pushing mechanism by the laser ranging mounting plate 312. During rotation, the positioning sensor 313 and the laser ranging sensor 318 detect the centering positioning of the metal pipeline grinding device. The positioning sensor 313 positions the four compression mechanisms in the centering positioning mechanism 1, and the laser ranging sensor 318 measures the position of the pushing mechanism from the metal pipeline at the position of the compression mechanism, and judges whether the distances measured by the laser ranging sensor 318 at the positions of the four compression mechanisms are the same, and makes fine adjustments.

[0035] In summary, an automatic grinding device for metal pressure pipelines provided in this article only needs to sleeve the device on the outer side of the pipeline when grinding the weld at the connection of the metal pipeline, and then connect and fix it to the metal pipeline through the centering positioning mechanism, so that the annular guide rail in the rotating mechanism is coaxial with the metal pipeline. Then, through the pushing mechanism, the grinding device is pushed to the grinding position, and then the angle grinder is turned on. The angle grinder is driven by the rotating mechanism to perform grinding, effectively replacing manual grinding, with high efficiency and good grinding effect.

Claims

1. An automatic grinding device for metal pipes, characterized in that: The invention comprises a rotating mechanism (2) surrounding a metal pipe (5), wherein a centering and positioning mechanism (1), a pushing mechanism (3) and a grinding device (4) are arranged on the rotating mechanism (2), wherein the centering and positioning mechanism (1) is used to align the center of the metal pipe (5), and the pushing mechanism (3) is used to drive the grinding device (4) to move.

2. The automatic grinding device for metal pipes according to claim 1, characterized in that: The centering and positioning mechanism (1) comprises a fixed motor base (120), the fixed motor base (120) is provided with a screw hole for fixedly connecting the centering and positioning mechanism (1) with the rotating mechanism (2), a support foot (110) is arranged on the side of the fixed motor base (120) facing the metal pipe (5), the support foot (110) is provided with an arc groove matching the outer surface of the metal pipe (5), a limit sensor (160) is also arranged on the side of the fixed motor base (120) facing the metal pipe (5), and a stepping motor (130), a screw rod (140) and a guide column (150) are respectively arranged on the side of the fixed motor base (120) facing away from the metal pipe (5).

3. The automatic grinding device for metal pipes according to claim 2, characterized in that: A total of four centering and positioning mechanisms (1) are provided and are evenly arranged along the rotating mechanism (2).

4. The automatic grinding device for metal pipes according to claim 3, characterized in that: The pushing mechanism (3) comprises a lifting mechanism (310), the lifting mechanism (310) is provided with a threaded hole, the lifting mechanism (310) is used to fix the pushing mechanism (3) and the rotating mechanism (2), a cross arm axial feeding mechanism (320) is arranged on the lifting mechanism (310), a grinder fixing device (330) is arranged on the cross arm axial feeding mechanism (320), the grinder fixing device (330) is used to fix the grinding wheel (410), and a support frame (340) is arranged below the grinder fixing device (330).

5. The automatic grinding device for metal pipes according to claim 4, characterized in that: The lifting mechanism (310) comprises a bottom plate (311), a laser distance measuring installation plate (312) is arranged on the side wall of the bottom plate (311), a positioning sensor (313) and a laser distance measuring sensor (318) are arranged on the laser distance measuring installation plate (312), a top plate (314) is arranged on the top of the bottom plate (311), a screw stepping motor (315) is arranged above the top plate (314), a tail plate (319) is arranged at the bottom of the bottom plate (311), a guide column (317) is arranged between the top plate (314) and the tail plate (319), a slider (316) is arranged on the guide column (317), and a connecting hole is arranged on the slider (316) for connecting with a cross arm axial feeding mechanism (320).

6. The automatic grinding device for metal pipes according to claim 5, characterized in that: The rotating mechanism (2) comprises an annular track (210), a fixing plate (250) is arranged on the annular track (210), and a roller (220) and a stepping motor driving gear (240) are arranged on the fixing plate (250).

7. The automatic grinding device for metal pipes according to claim 6, characterized in that: A groove is provided on the annular track (210), and the fixing plate (250) moves along the groove via the roller (220).

8. The automatic grinding device for metal pipes according to claim 7, characterized in that: Four rollers (220) are provided, two of which are provided above and below the groove respectively.

9. The automatic grinding device for metal pipes according to claim 8, characterized in that: When a plurality of annular tracks (210) form the entire track, adjacent annular tracks (210) are fixedly connected by connecting pieces.

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